ttylog: 0.29 -> 0.31

Semi-automatic update. These checks were performed:

- built on NixOS
- ran `/nix/store/fip4dfisnx3d9wg45s8bqip4rdnica0j-ttylog-0.31/bin/ttylog -h` got 0 exit code
- ran `/nix/store/fip4dfisnx3d9wg45s8bqip4rdnica0j-ttylog-0.31/bin/ttylog --help` got 0 exit code
- ran `/nix/store/fip4dfisnx3d9wg45s8bqip4rdnica0j-ttylog-0.31/bin/ttylog help` got 0 exit code
- ran `/nix/store/fip4dfisnx3d9wg45s8bqip4rdnica0j-ttylog-0.31/bin/ttylog -V` and found version 0.31
- ran `/nix/store/fip4dfisnx3d9wg45s8bqip4rdnica0j-ttylog-0.31/bin/ttylog -v` and found version 0.31
- ran `/nix/store/fip4dfisnx3d9wg45s8bqip4rdnica0j-ttylog-0.31/bin/ttylog --version` and found version 0.31
- ran `/nix/store/fip4dfisnx3d9wg45s8bqip4rdnica0j-ttylog-0.31/bin/ttylog version` and found version 0.31
- ran `/nix/store/fip4dfisnx3d9wg45s8bqip4rdnica0j-ttylog-0.31/bin/ttylog -h` and found version 0.31
- ran `/nix/store/fip4dfisnx3d9wg45s8bqip4rdnica0j-ttylog-0.31/bin/ttylog --help` and found version 0.31
- ran `/nix/store/fip4dfisnx3d9wg45s8bqip4rdnica0j-ttylog-0.31/bin/ttylog help` and found version 0.31
- found 0.31 with grep in /nix/store/fip4dfisnx3d9wg45s8bqip4rdnica0j-ttylog-0.31
- found 0.31 in filename of file in /nix/store/fip4dfisnx3d9wg45s8bqip4rdnica0j-ttylog-0.31

cc "@wkennington"